- So Joo-yeon - Yoon A-reum
- Seo Eun-soo - Woo Yeon-hwa
- Yoon Na-moo - Jeong In-soo
- Jin Kyung - Oh Myeong-shim
- ??? - Jang Gi-tae
- ??? - Nam Do-il
- Kim Min-jae - Park Eun-tak
- ??? - Song Hyeon-cheol
- ??? - Mr. Goo Hwang-woo
- Jeong Ji-an - Uhm Hyeon-jeong
- Ko Sang-ho - Yang Ho-joon
- ??? - Joo Young-mi
- ??? - Shim Hye-jin
- ??? - Cha Jin-man
- ??? - Jang Dong-hwa
- Kim Yong-jin - Chief Lee
- Lee Hong-nae - Lee Seon-woong
- Choi Jin-ho - Do Yoon-wan
- Kim Bo-jeong - Nurse Uhm
- Moon Ah-ram - Nurse at Doldam Hospital
- Park Jin-ah - Hyeon Ji-hyeong
- ??? - Loan Shark
- Lim Cheol-soo - Loan Shark
- Im Jae-geun - Paramedic Heo
- ?? - Manager Joo
- Park Jong hwan - Lim Hyeon-joon
- Lee Min-woong - Ryu Joon-gil
- ??? - Yoo Woon-young
- Shin Dong-hoon - Bodyguard
- Bae Myeong-jin - Heo Young-gyu
- Bae Myeong-jin - Nurse Nam
- Kim Jung-young - Dong-joo's Mother
- Kim Jung-young - Kang Dong-joo's mother
- Lee Ji-ha - Eun-jae's Mother
- Lee Ji-ha - Cha Eun-jae's Mother
- Jeong Han-seol - Seong Yoon
- Jeong Han-seol - Jo Sung-yoon
- ?? - Shin Myeong-ho
- ?? - Chairman Shin Myung Ho [Former chairman]
- Kim Joong-ki - Cardiothoracic Surgeon
- Tae In-ho - Moon Tae-ho
- Jeong Kang-hee - Anal Patient
- Lee Ji-yeon - Nurse Jin
- ??? - Ham Seung-ho
- ??? - Young Gyun
- ??? - Webtoon writer
- Kang Chan - Park Joo-hyuk
- Han Gab-soo - Park Joo-hyuk's father
- Park Doo-sik - Boyfriend of the appendicitis patient fertilizer
- Yoon Chan-young - Kang Dong-joo (Young)
- ??? - a bad customer
- Heo An-na - a bad customer
- ??? - Shin Hyeong-jeong
- Lee Do-yeop - Captain Yoo In-sik
- ??? - Interviewee Ha Yoon-kyung
- ??? - Interviewee
- ??? - Interviewee
- ??? - Interviewee
- Im Sung-jae - Interviewee
- Kim Chul-yoon - North Korean Defector
- Kim Beom-seok - Ko Eun-ho
- Ha Dong-jun - Kang Sung-jin
- Ryu Seung-soo - Ski Jumping Coach
- Kang Myeong-ju - Deceased Person's Mother
- Ahn Sang-woo - Professor Park
- Lee Hyo-je - Do In Bum [Young]
- Lee Yong-i - [Patient's mother]
- Ri Min - [Truck driver involved in an accident]
- Choi Kyo-sik - Taxi driver
- Kim Hye-jun - Jang Hyun-joo
- Yu Eun-mi - Ah Rin
- Lee Myung-haeng - Choi Kyung Young
- Kwon Hyuk-soo - Ryu Woong Il [Minister]
- Kwon Hyuk-soo - Defense Minister Ryu Woong-il
- Kim Jun-won - Auditor Choi
- Lee Kang-wook - [Drunken driver]
- Park Seoung-tae - [Car crash victim]
- Kim Nam-jin - Joo Hyuk's mother
- Park Young-soo - [Healthcare center employee]
- Cha Jung-won - Soo Jung
- Kim Min-sang - Oh Sung Jae [Reporter]
- Lee Chae-kyung - [Patient's mother]
- Kim Ji-eun - [Yoon Wan's secretary]
- Lee Jae-woo - Ahn Woo Yeol
- ??? - [Patient's wife]
- Cho Wan-ki - Dr. Lee
- ??? - [Moon Jung’s father]
- ??? - Bae Moon-jung's Father
- Nam Jeong-woo - [Geodae Hospital doctor]
- Shin Dong-ryeok - Il Joong [Geodae Hospital doctor]
- Kim Jong-tae - Professor Oh [CS Specialist]
- Seo Jung-hoo - [119 operator]
- Gu Bon-jin - [Lieutenant commander]
- Ahn Su-bin - [TV reporter]
- Jung Young-hoon - [Security]
- Jin Yong-uk - [Soo Jin's father / Patient]
- Kim Ga-young - [Soo Jin's mother]
- Kim Dong-hyun - [Violent husband]
- Cherish Maningat - [Domestic abused victim]
- Lee Seong-woo - [Gangster #3]
- Min Sang-woo - [Chest patient]
- ??? - Joon Young [Prisoner]
- Kim Jin - Choi Soon-young [Paramedic]
- Woo Hyun-ju - [Joon Young's mother]
- Hong Seok-yeon - [Violent drunk man]
- Jeong Hyun-seok - [Organ transplant doctor]
- Ji Hye-won - Seo Se Young [Trainee nurse]
- Lee Ji-hae - [Pregnant bus passenger]
- Choi Yun-seol - [Bus passenger]
- Kim No-jin - Jung Ga Young [Rape victim]
- Park Ki-ryung - [Yoon Wan's associate]
- Lee Yun-sang - [Yoon Wan's associate]
- Jang Ui-don - [Local police officer]
- Kang Suk-won - Hyung Joon [Woo Jin's ex colleague]
- Cheon So-Ra - [Nurse]
- Song Chang-gyu - Song Chang Gyu
- ??? - Kang Ik Joon [VIP Patient]
- ??? - Cabo Lightning
- Ahn Soo-ho - [Tow yard worker]
- Hwang Jae-yeol - Detective Go
- Hwang Jae-yeol - Detective Go [Police detective]
- Kim Seo-won - Lee Dong Woo [Amputee]
- Jung Hyeon-jun - [Dong Woo's son]
- Kang Hyung-suk - [Ik Joon's brother]
- Han Sang-chul - [Hiker]
- Lee Young-sil - [Patient's wife]
- Park Ga-young - [Nurse]
- Jeon Jin-oh - Lee Dae Young [Minister Ryu's bodyguard]
- Park Ha-joon - Kim Han-wool
- Jo Eun-sol - Jung Byeol
- Lee Ji-hyeon - Choi Soon-young's Mother
- ??? - Bae Yu-rim's Mother
- Jang Nam-yeol - Bus Terminal's Cleaner (Chief Lee's Uncle-in-Law)
- Woo Ji-hyeon - Jeon Kyung-soo
- Kim Kyun-ha - Choi Seok-gu
- Park Ji-hoon - First Lieutenant Kang Bo-seung
- Lee Bong-joon - Choi Seok-gu's Friend
- Jang Young-hyeon - Heo Byung-bae
- Cha Solomon - Choi Seok-gu's Friend
- Lee Jin-hong - Anesthetic Nurse
- Lee Do-guk - Chief Park of Field Control Team
- Cho Dong-in - Math Academy Teacher
- Lee Ga-yeon - Seo Joo-young
- Yoo Sung-min - Student Park Jung-min
- Han Gi-joong - Head of Jongseon
- Guk Joong-woong - Patient Guardian who Complain
- Byun Joong-hee - Patient with Dementia
- Lee Seung-won - Guardian of Patient with Wheelchair
- Jung Woo-jae - Woo Sang-min
- Bae Bo-ram - Doctor
- Shin Hye-ji - Patient Min-jung
- Kim Jae-man - Vomitting Patient
- Kwak Jin - Fighting Brother Patient
- Kim Da-huin - Officer Choi
- Han Kyu-won - Yeom Jung-do
- Park Seong-chan - Anesthesiologist
- Park Joo-yong - Embolism Patient
- Kim Do-won - Heo Ye-jun
- Kim Si-on - Heo Ye-jun's Sister
- Lee Han-ju - Angry Patient
- Ryu Ye-ri - Jung In-soo's Wife
- Jeong Ae-hwa - Villa resident
- Choi Sol-hee - Villa resident
- Min Woo-gi - Patient
- Jeong Doo-won - Cramps patient's husband
- Han Ki-jang - Firefighter
- Kim Do-hyeong - Cha Jin Man's chauffeur
- Oh Min-jeong - Tteokbokki restaurant owner
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